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207799

Sigma-Aldrich

Potassium thiocyanate

ACS reagent, 99%

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Synonym(s):
Potassium rhodanide
Linear Formula:
KSCN
CAS Number:
333-20-0
Molecular Weight:
97.18
Beilstein:
3594799
EC Number:
206-370-1
MDL number:
MFCD00011413
UNSPSC Code:
12352302
PubChem Substance ID:
329752022

grade

ACS reagent

Quality Level

200

Assay

99%

form

crystalline powder

impurities

Iodine consuming substances, passes test
≤0.005% insol. water

color

colorless to white

pH

5.3-8.7 (25 °C, 5%)

mp

173 °C (lit.)

anion traces

chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.005%

cation traces

Fe: ≤2 ppm
NH4+: ≤0.003%
Na: ≤0.005%
heavy metals (as Pb): ≤5 ppm

SMILES string

[K]SC#N

InChI

1S/CHNS.K/c2-1-3;/h3H;/q;+1/p-1

InChI key

ZNNZYHKDIALBAK-UHFFFAOYSA-M

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General description

Potassium thiocyanate is an inorganic potassium salt. Phase transitions in potassium thiocyanate (KSCN) have been investigated by X-ray diffraction studies. The order-disorder type transition with respect to the orientation of the thiocyanate ions was identified. Its polarized infrared spectrum has been reported. It participates in the ring-opening of aziridines. The reaction was carried out in the presence of sulfated zirconia to afford the corresponding β-aminothiocyanates.

Application

Potassium thiocyanate (KSCN) may be used for the colorimetric quantification of intracellular iron content of the superparamagnetic iron oxide (SPIO) nanoparticles.
Potassium thiocyanate may be used in the synthesis of the following:
  • α-Amino nitriles from tertiary amines.
  • Polysubstituted 2-aminothiazoles from vinyl azides.
  • Benzisothiazol-3(2H)-one derivatives from o-bromobenzamides.
  • Diaryl thioethers from aryl halides.

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Aquatic Chronic 3 - Eye Dam. 1

Supplementary Hazards

EUH032

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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Synthesis of diaryl thioethers from aryl halides and potassium thiocyanate.
Hajipour AR, et al.
Applied Organometallic Chemistry, 28(12), 879-879 (2014)
Potassium Thiocyanate as Source of Cyanide for the Oxidative α-Cyanation of Tertiary Amines.
Wagner A and Ofial AR.
The Journal of Organic Chemistry, 80(5), 2848-2854 (2015)
Iron (II)-Promoted Synthesis of 2-Aminothiazoles via C=N Bond Formation from Vinyl Azides and Potassium Thiocyanate.
Zhang G, et al.
Advanced Synthesis & Catalysis, 357(5), 1065-1069 (2015)
The Phase Transition of Crystalline Potassium Thiocyanate, KSCN. II. X-Ray Study.
Yamada Y and Watanabe T.
Bulletin of the Chemical Society of Japan, 36(8), 1032-1037 (1963)
Regioselective ring-opening of aziridines with potassium thiocyanate and thiols using sulfated zirconia as a heterogeneous recyclable catalyst.
Das B, et al.
Tetrahedron Letters, 47(5), 779-782 (2006)
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